Rank the following solutions in order of increasing boiling point: 2.5 m fructose, C₆H₁₂O₆, 2.0 m NaCl, 1.5 m methanol, CH₃OH, and 2.2 m Al(NO₃)₃ A)C₆H₁₂O₆

Question

Rank the following solutions in order of increasing boiling point: 2.5 m fructose, C₆H₁₂O₆, 2.0 m NaCl, 1.5 m methanol, CH₃OH, and 2.2 m Al(NO₃)₃ A)C₆H₁₂O₆ < Al(NO₃)₃< NaCl < CH₃OH B)CH₃OH < Al(NO₃)₃ < NaCl < C₆H₁₂O₆ C)Al(NO₃)₃< NaCl < C₆H₁₂O₆ < CH₃OH D)CH₃OH < C₆H₁₂O₆ < NaCl < Al(NO₃)₃ E)CH³OH < C₆H₁₂O₆ < Al(NO₃)₃ < NaCl

Quizplus · Accepted Answer

The boiling point elevation of a solution is directly proportional to its molality (m) and the boiling point constant (Kb) of the solvent (ΔTb = Kb × m). Since all the given solutions use water as the solvent, their boiling points will be affected by the molality of their solutes only. Among the given choices, the solution with the lowest molality is CH₃OH (1.5 m), while the solution with the highest molality is C₆H₁₂O₆ (2.5 m). Therefore, the order of increasing boiling points will be CH₃OH < C₆H₁₂O₆ < NaCl (2.0 m) < Al(NO₃)₃ (2.2 m). The correct choice is D.

Rank the Following Solutions in Order of Increasing Boiling Point